# std::chrono::year_month_day_last::ok

From cppreference.com
< cpp‎ | chrono‎ | year month day last

constexpr bool ok() const noexcept; |  | (since C++20)

Checks if *this represents a valid date. Because a `year_month_day_last` represents the last day of a particular month, it represents a valid date as long as the year and month are valid.

### Return value

year().ok() && month().ok()

### Example

Run this code

    #include <cassert>
    #include <chrono>

    int main()
    {
        auto ymdl{std::chrono::last/11/2020};
        assert(ymdl.ok());
        ymdl = std::chrono::year(2020)/std::chrono::month(13)/std::chrono::last;
        assert(not ymdl.ok());
    }

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